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Beyond the absorption-limited nonlinear phase shift with microring resonators.

Steve Blair, John E Heebner, Robert W Boyd

    Optics Letters
    |November 17, 2007
    PubMed
    Summary
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    Ring resonators offer superior nonlinear phase shifts compared to bulk materials, even with absorption losses. This enhancement improves device performance, such as in Mach-Zehnder interferometers.

    Area of Science:

    • Nonlinear optics
    • Optical materials science
    • Photonics

    Background:

    • Nonlinear optical materials are crucial for phase shifting applications.
    • Absorption losses in materials can limit the effectiveness of nonlinear optical devices.
    • Ring resonators offer potential for enhanced light-matter interactions.

    Purpose of the Study:

    • To compare the nonlinear phase shift performance of ring resonators versus bulk nonlinear materials.
    • To evaluate the figure of merit for ring resonators considering absorption.
    • To investigate the impact of ring resonators on Mach-Zehnder interferometer switching characteristics.

    Main Methods:

    • Theoretical analysis of nonlinear phase shift in ring resonators and bulk materials.
    • Inclusion of linear and nonlinear absorption in the models.

    Related Experiment Videos

  • Calculation of the figure of merit (phase shift × throughput).
  • Simulation of Mach-Zehnder interferometer performance with ring resonators.

    • Main Results:

    • Ring resonators can achieve a greater nonlinear phase shift than an infinite length of the same bulk material, even with absorption.
    • The figure of merit for ring resonators is superior to that of the native nonlinear absorbing material.
    • Incorporating ring resonators enhances the switching characteristics of a Mach-Zehnder interferometer.

    Conclusions:

    • Ring resonators are effective nonlinear phase-shifting elements.
    • The use of ring resonators overcomes limitations imposed by absorption in bulk nonlinear materials.
    • Ring resonators offer a pathway to improved performance in photonic switching devices.